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+/*
+ * ngtcp2
+ *
+ * Copyright (c) 2017 ngtcp2 contributors
+ * Copyright (c) 2012 nghttp2 contributors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+ * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+ * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+#ifndef UTIL_H
+#define UTIL_H
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif // HAVE_CONFIG_H
+
+#include <sys/socket.h>
+
+#include <optional>
+#include <string>
+#include <random>
+#include <unordered_map>
+#include <string_view>
+
+#include <ngtcp2/ngtcp2.h>
+#include <nghttp3/nghttp3.h>
+
+#include <ev.h>
+
+namespace ngtcp2 {
+
+namespace util {
+
+inline nghttp3_nv make_nv(const std::string_view &name,
+ const std::string_view &value, uint8_t flags) {
+ return nghttp3_nv{
+ reinterpret_cast<uint8_t *>(const_cast<char *>(std::data(name))),
+ reinterpret_cast<uint8_t *>(const_cast<char *>(std::data(value))),
+ name.size(),
+ value.size(),
+ flags,
+ };
+}
+
+inline nghttp3_nv make_nv_cc(const std::string_view &name,
+ const std::string_view &value) {
+ return make_nv(name, value, NGHTTP3_NV_FLAG_NONE);
+}
+
+inline nghttp3_nv make_nv_nc(const std::string_view &name,
+ const std::string_view &value) {
+ return make_nv(name, value, NGHTTP3_NV_FLAG_NO_COPY_NAME);
+}
+
+inline nghttp3_nv make_nv_nn(const std::string_view &name,
+ const std::string_view &value) {
+ return make_nv(name, value,
+ NGHTTP3_NV_FLAG_NO_COPY_NAME | NGHTTP3_NV_FLAG_NO_COPY_VALUE);
+}
+
+std::string format_hex(uint8_t c);
+
+std::string format_hex(const uint8_t *s, size_t len);
+
+std::string format_hex(const std::string_view &s);
+
+template <size_t N> std::string format_hex(const uint8_t (&s)[N]) {
+ return format_hex(s, N);
+}
+
+std::string decode_hex(const std::string_view &s);
+
+// format_durationf formats |ns| in human readable manner. |ns| must
+// be nanoseconds resolution. This function uses the largest unit so
+// that the integral part is strictly more than zero, and the
+// precision is at most 2 digits. For example, 1234 is formatted as
+// "1.23us". The largest unit is seconds.
+std::string format_durationf(uint64_t ns);
+
+std::mt19937 make_mt19937();
+
+ngtcp2_tstamp timestamp(struct ev_loop *loop);
+
+bool numeric_host(const char *hostname);
+
+bool numeric_host(const char *hostname, int family);
+
+// Dumps |src| of length |len| in the format similar to `hexdump -C`.
+void hexdump(FILE *out, const uint8_t *src, size_t len);
+
+inline char lowcase(char c) {
+ constexpr static unsigned char tbl[] = {
+ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14,
+ 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29,
+ 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44,
+ 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59,
+ 60, 61, 62, 63, 64, 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j',
+ 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y',
+ 'z', 91, 92, 93, 94, 95, 96, 97, 98, 99, 100, 101, 102, 103, 104,
+ 105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 115, 116, 117, 118, 119,
+ 120, 121, 122, 123, 124, 125, 126, 127, 128, 129, 130, 131, 132, 133, 134,
+ 135, 136, 137, 138, 139, 140, 141, 142, 143, 144, 145, 146, 147, 148, 149,
+ 150, 151, 152, 153, 154, 155, 156, 157, 158, 159, 160, 161, 162, 163, 164,
+ 165, 166, 167, 168, 169, 170, 171, 172, 173, 174, 175, 176, 177, 178, 179,
+ 180, 181, 182, 183, 184, 185, 186, 187, 188, 189, 190, 191, 192, 193, 194,
+ 195, 196, 197, 198, 199, 200, 201, 202, 203, 204, 205, 206, 207, 208, 209,
+ 210, 211, 212, 213, 214, 215, 216, 217, 218, 219, 220, 221, 222, 223, 224,
+ 225, 226, 227, 228, 229, 230, 231, 232, 233, 234, 235, 236, 237, 238, 239,
+ 240, 241, 242, 243, 244, 245, 246, 247, 248, 249, 250, 251, 252, 253, 254,
+ 255,
+ };
+ return tbl[static_cast<unsigned char>(c)];
+}
+
+struct CaseCmp {
+ bool operator()(char lhs, char rhs) const {
+ return lowcase(lhs) == lowcase(rhs);
+ }
+};
+
+template <typename InputIterator1, typename InputIterator2>
+bool istarts_with(InputIterator1 first1, InputIterator1 last1,
+ InputIterator2 first2, InputIterator2 last2) {
+ if (last1 - first1 < last2 - first2) {
+ return false;
+ }
+ return std::equal(first2, last2, first1, CaseCmp());
+}
+
+template <typename S, typename T> bool istarts_with(const S &a, const T &b) {
+ return istarts_with(a.begin(), a.end(), b.begin(), b.end());
+}
+
+// make_cid_key returns the key for |cid|.
+std::string make_cid_key(const ngtcp2_cid *cid);
+std::string make_cid_key(const uint8_t *cid, size_t cidlen);
+
+// straddr stringifies |sa| of length |salen| in a format "[IP]:PORT".
+std::string straddr(const sockaddr *sa, socklen_t salen);
+
+// strccalgo stringifies |cc_algo|.
+std::string_view strccalgo(ngtcp2_cc_algo cc_algo);
+
+template <typename T, size_t N>
+bool streq_l(const T (&a)[N], const nghttp3_vec &b) {
+ return N - 1 == b.len && memcmp(a, b.base, N - 1) == 0;
+}
+
+namespace {
+constexpr char B64_CHARS[] = {
+ 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M',
+ 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z',
+ 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm',
+ 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',
+ '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '+', '/',
+};
+} // namespace
+
+template <typename InputIt> std::string b64encode(InputIt first, InputIt last) {
+ std::string res;
+ size_t len = last - first;
+ if (len == 0) {
+ return res;
+ }
+ size_t r = len % 3;
+ res.resize((len + 2) / 3 * 4);
+ auto j = last - r;
+ auto p = std::begin(res);
+ while (first != j) {
+ uint32_t n = static_cast<uint8_t>(*first++) << 16;
+ n += static_cast<uint8_t>(*first++) << 8;
+ n += static_cast<uint8_t>(*first++);
+ *p++ = B64_CHARS[n >> 18];
+ *p++ = B64_CHARS[(n >> 12) & 0x3fu];
+ *p++ = B64_CHARS[(n >> 6) & 0x3fu];
+ *p++ = B64_CHARS[n & 0x3fu];
+ }
+
+ if (r == 2) {
+ uint32_t n = static_cast<uint8_t>(*first++) << 16;
+ n += static_cast<uint8_t>(*first++) << 8;
+ *p++ = B64_CHARS[n >> 18];
+ *p++ = B64_CHARS[(n >> 12) & 0x3fu];
+ *p++ = B64_CHARS[(n >> 6) & 0x3fu];
+ *p++ = '=';
+ } else if (r == 1) {
+ uint32_t n = static_cast<uint8_t>(*first++) << 16;
+ *p++ = B64_CHARS[n >> 18];
+ *p++ = B64_CHARS[(n >> 12) & 0x3fu];
+ *p++ = '=';
+ *p++ = '=';
+ }
+ return res;
+}
+
+// read_mime_types reads "MIME media types and the extensions" file
+// denoted by |filename| and returns the mapping of extension to MIME
+// media type.
+std::optional<std::unordered_map<std::string, std::string>>
+read_mime_types(const std::string_view &filename);
+
+// format_uint converts |n| into string.
+template <typename T> std::string format_uint(T n) {
+ std::string res;
+ if (n == 0) {
+ res = "0";
+ return res;
+ }
+ size_t nlen = 0;
+ for (auto t = n; t; t /= 10, ++nlen)
+ ;
+ res.resize(nlen);
+ for (; n; n /= 10) {
+ res[--nlen] = (n % 10) + '0';
+ }
+ return res;
+}
+
+// format_uint_iec converts |n| into string with the IEC unit (either
+// "G", "M", or "K"). It chooses the largest unit which does not drop
+// precision.
+template <typename T> std::string format_uint_iec(T n) {
+ if (n >= (1 << 30) && (n & ((1 << 30) - 1)) == 0) {
+ return format_uint(n / (1 << 30)) + 'G';
+ }
+ if (n >= (1 << 20) && (n & ((1 << 20) - 1)) == 0) {
+ return format_uint(n / (1 << 20)) + 'M';
+ }
+ if (n >= (1 << 10) && (n & ((1 << 10) - 1)) == 0) {
+ return format_uint(n / (1 << 10)) + 'K';
+ }
+ return format_uint(n);
+}
+
+// format_duration converts |n| into string with the unit in either
+// "h" (hours), "m" (minutes), "s" (seconds), "ms" (milliseconds),
+// "us" (microseconds) or "ns" (nanoseconds). It chooses the largest
+// unit which does not drop precision. |n| is in nanosecond
+// resolution.
+std::string format_duration(ngtcp2_duration n);
+
+// parse_uint parses |s| as 64-bit unsigned integer. If it cannot
+// parse |s|, the return value does not contain a value.
+std::optional<uint64_t> parse_uint(const std::string_view &s);
+
+// parse_uint_iec parses |s| as 64-bit unsigned integer. It accepts
+// IEC unit letter (either "G", "M", or "K") in |s|. If it cannot
+// parse |s|, the return value does not contain a value.
+std::optional<uint64_t> parse_uint_iec(const std::string_view &s);
+
+// parse_duration parses |s| as 64-bit unsigned integer. It accepts a
+// unit (either "h", "m", "s", "ms", "us", or "ns") in |s|. If no
+// unit is present, the unit "s" is assumed. If it cannot parse |s|,
+// the return value does not contain a value.
+std::optional<uint64_t> parse_duration(const std::string_view &s);
+
+// generate_secure_random generates a cryptographically secure pseudo
+// random data of |datalen| bytes and stores to the buffer pointed by
+// |data|.
+int generate_secure_random(uint8_t *data, size_t datalen);
+
+// generate_secret generates secret and writes it to the buffer
+// pointed by |secret| of length |secretlen|. Currently, |secretlen|
+// must be 32.
+int generate_secret(uint8_t *secret, size_t secretlen);
+
+// normalize_path removes ".." by consuming a previous path component.
+// It also removes ".". It assumes that |path| starts with "/". If
+// it cannot consume a previous path component, it just removes "..".
+std::string normalize_path(const std::string_view &path);
+
+constexpr bool is_digit(const char c) { return '0' <= c && c <= '9'; }
+
+constexpr bool is_hex_digit(const char c) {
+ return is_digit(c) || ('A' <= c && c <= 'F') || ('a' <= c && c <= 'f');
+}
+
+// Returns integer corresponding to hex notation |c|. If
+// is_hex_digit(c) is false, it returns 256.
+constexpr uint32_t hex_to_uint(char c) {
+ if (c <= '9') {
+ return c - '0';
+ }
+ if (c <= 'Z') {
+ return c - 'A' + 10;
+ }
+ if (c <= 'z') {
+ return c - 'a' + 10;
+ }
+ return 256;
+}
+
+template <typename InputIt>
+std::string percent_decode(InputIt first, InputIt last) {
+ std::string result;
+ result.resize(last - first);
+ auto p = std::begin(result);
+ for (; first != last; ++first) {
+ if (*first != '%') {
+ *p++ = *first;
+ continue;
+ }
+
+ if (first + 1 != last && first + 2 != last && is_hex_digit(*(first + 1)) &&
+ is_hex_digit(*(first + 2))) {
+ *p++ = (hex_to_uint(*(first + 1)) << 4) + hex_to_uint(*(first + 2));
+ first += 2;
+ continue;
+ }
+
+ *p++ = *first;
+ }
+ result.resize(p - std::begin(result));
+ return result;
+}
+
+int make_socket_nonblocking(int fd);
+
+int create_nonblock_socket(int domain, int type, int protocol);
+
+std::optional<std::string> read_token(const std::string_view &filename);
+int write_token(const std::string_view &filename, const uint8_t *token,
+ size_t tokenlen);
+
+const char *crypto_default_ciphers();
+
+const char *crypto_default_groups();
+
+// split_str parses delimited strings in |s| and returns substrings
+// delimited by |delim|. The any white spaces around substring are
+// treated as a part of substring.
+std::vector<std::string_view> split_str(const std::string_view &s,
+ char delim = ',');
+
+// parse_version parses |s| to get 4 byte QUIC version. |s| must be a
+// hex string and must start with "0x" (.e.g, 0x00000001).
+std::optional<uint32_t> parse_version(const std::string_view &s);
+
+} // namespace util
+
+std::ostream &operator<<(std::ostream &os, const ngtcp2_cid &cid);
+
+} // namespace ngtcp2
+
+#endif // UTIL_H
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